[TASK] Rewrite "Show hidden content elements" to JavaScript

This patch refactors the "Page" module to always render hidden records.
If the "Show hidden content elements" checkbox is set,
the hidden elements are removed by JavaScript.

This functionality is NOT ported to QuickEdit, as this part needs
further refactoring.

Resolves: #67831
Releases: master
Change-Id: I5396a8c3ef8b3b11220c168c38aadf326bea38a8
Reviewed-on: http://review.typo3.org/40740


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>